US 12,226,880 B2
Method of controlling a pulsed current supplied to a motor of an electric power tool
Adam Klotblixt, Stockholm (SE)
Assigned to ATLAS COPCO INDUSTRIAL TECHNIQUE AB, Stockholm (SE)
Filed by ATLAS COPCO INDUSTRIAL TECHNIQUE AB, Stockholm (SE)
Filed on May 28, 2021, as Appl. No. 17/333,095.
Application 17/333,095 is a division of application No. 16/313,691, granted, now 11,364,604, previously published as PCT/EP2017/064921, filed on Jun. 19, 2017.
Claims priority of application No. 1630172-3 (SE), filed on Jun. 30, 2016.
Prior Publication US 2021/0283753 A1, Sep. 16, 2021
Int. Cl. B25B 21/02 (2006.01); B25B 21/00 (2006.01); B25B 23/14 (2006.01); B25B 23/142 (2006.01); B25B 23/147 (2006.01); H02P 7/03 (2016.01)
CPC B25B 21/02 (2013.01) [B25B 21/00 (2013.01); B25B 23/1405 (2013.01); B25B 23/1425 (2013.01); B25B 23/147 (2013.01); H02P 7/03 (2016.02)] 14 Claims
OG exemplary drawing
 
1. A method of controlling a pulsed current supplied to a motor of an electric power tool that includes a rotating shaft driven by the motor, the method comprising:
providing a main current pulse (A) in a first direction driving the rotating shaft in a first direction to add torque to a joint;
after providing the main current pulse (A), providing a current pulse (C) in an opposite direction to the first direction;
immediately prior to providing the current pulse (C) in the opposite direction, providing a first pre-pulse current pulse (B) that is in the same direction as the current pulse (C) in the opposite direction and of a magnitude lower than the current pulse (C) in the opposite direction; and
immediately prior to providing the main current pulse (A), providing a second pre-pulse current pulse (D) that is in the same direction as the main current pulse (A) and of a magnitude lower than the main current pulse (A),
wherein the first pre-pulse current pulse (B) follows the main current pulse (A).